Frank w



. (ModeL) I F. w. MIX. Case for Indicator Locks.

No. 239,616. PatentedApril 5, H881.

a WITNESSES: INVENTOR:

v ATTORNEYS.

N. PETERS. PHOTO-LITHOGRAPHER, WASHINGTON. 0. C4

UNITED STATES PATENT OFFICEO FRANK VV.,MIX, OETERRYVILLE, CONNECTICUT, ASSIGNOR TO THE EAGLE LOCK COMPANY, OF SAME PLACE.

CASE FOR INDICATOR-LOCKS.

I SPECIFIGATION fQrming part of Letters Patent No. 239,616, dated April 5, 1881.

Application filed January 15, 1881.

cltwhom it may concern:

Be it known that I, FRANK W. MIX, of Terryville, in thccounty of Litchfield and State of Connecticut, have invented a new and 1m- 5 provedCaseforIndicator-Locks; andIdohereby declare thatthefollowing isafull, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure '1 is aninside view of the cup-shaped section of the shell which carries the locking mechanism. Fig. 2 is a view of the same part with the middle plate applied thereto. Fig. 3 is a view of the middle plate opposite to that shown in Fig. 2. Fig. 4 is a cross-section through theline m0 ofFig. 2. Fig.5 is an edge view of the lock, with the shackle-seat in section. Figs. 6 and 7 are details of the ear and shackle-pin.

My invention relates to a novel construction of lock-case, designed to meet the requirement of that type of indicator-padlock in which the bolt mechanism and indicator mechanism are arranged in different planes, with a supporting- 2 plate between the same. The object sought by me is to combine economy in the manufacture of the case with intrinsic merit in its structure, the principal points aimed at being the largest amount of room for the indicator o mechanism in the smallest compass of case,

and such a structure of a three-part case as' will avoid strain on the rivets. These ends are attained by my improved case, which I will now proceed to describe in detail.

In the drawings, A A A are the three parts of the case, of substantially the same diameter and connected by peripheral joints. The part A is the back plate, and is made cup-shaped, with a considerable rim or peripheral portion. 0 The part A is the intermediate supportingplate for the indicator mechanism, which plate is more or less cut out, as shown in Fig. 3, and is also made with a peripheral rim corresponding in diameter to the rim of A, while the part 4 5 A is a plain flat disk. All these parts are in practice made of sheet-steel, and the parts A and A, which have rims, are struck up cold. My object in thus striking up these parts from sheetmetal is to secure a uniform thickness of metal and to facilitate the finishing of the case.

(ModeL) These parts of the case, it will be seen, are all of the same diameter, and the two parts which are made cup-shaped have the bottom edge of one cup-shaped piece fitting against the rim of the other cup-shaped piece. Although the 5 three parts of the lock-case are all cut from the same thickness of metal, the central portion of the middle plate is afterward reducedin thickness, except at its edges, where thefull strength of the metal is required for the rivets.

Between the parts A and A the bolt mechanism is to be arranged, while between A and A is contained the indicator mechanism which is carried by its supporting-plate A, and the figures on the dials of which mechanism show through suitable holes in the face-plate A which holes are located, as is also the key-hole,

at such points as the peculiar mechanism of the lock may necessitate or render desirable.

To fasten the three parts of my case togeth- 7o er I resort to a peculiar construction and mode of operation. If the three parts of the case are connected by a set of rivets of the same length, all passing through all three parts, much valuable space in the indicator-compartnient is sacrificed and the movement of the parts therein interfered with and, besides, the case is weak, for diagonal blows on the lock-case are liable to make the parts grind on each other and strain the rivets. I employ but one rivet, a, which passes through the wholeloc'k, and this fastens the part A to A then I attach to the back side of A, Fig. 3, three short rivets, b b b, that fasten A to A; and then to the top side of A, I attach another short rivet, 0, Figs. 2 and 4, that fastens A and A together. Now, in riveting up these parts, I first attach A and A by swaging the rivet c, which can be done without strain to the parts, since both ends of the rivet are accessible, so that one end may have a rest while the other end is being hammered. Then I fasten these two parts A and A to A by successively riveting c and b b 1). Of these rivets, a, it will be seen, has both ends accessible, so that it may have a rest on one side 5 while it is being hammered on the other but the rivets b, it will be perceived, rely for their resistance to the riveting strain upon the middle plate, A. To prevent springing this plate,

which "might render the indicator mechanism inoperative, the rivets b b b are placed close to the periphery, where they have the strength of the rim to sustain the strain, and they are made with broad shoulders; and, besides, a greater thickness of metal is left in the plate just adjacent to the rims, (see Figs. 2 and 4,) so that the combined influence of location,stren gth of metal, and size of shoulder permit this riveting to be successfully accomplished without involving any springing of the parts or other objectionable incidents. Y

To prevent the parts of the case from movin g over each other when struck by an obliquelydelivered blow, Irabbet the adjacent edges of each of the parts at the peripheral joints, as in Fig. 4, so that each part telescopes a short distance into the next to make, when the parts are riveted, afirm and rigid whole.

For receiving the shackle-bar I construct a peculiar pocket, rivet, or fulcrum-joint, as follows: The part Ais formed with an opening in its rim and an ear, d. I then form separately a piece, B,having an ear, f, with a fulcrum-pin, e, which is milled to form a shoulder, and whose end passes through a perforation in the ear 01. With the separate ear f is formed a curved right-angular segment, g, which, when the ears are fitted together, closes all communication between the inside of the lock and the fulcrumseat. This segment has two lugs, which are designed to pass through two slots in the part A and beriveted. These lugs are, however, not absolutely necessary, for the sides of the segment at 1 1, Fig. 6, bear against the rim of part A (see dotted lines, Figs. 1 and'2) and prevent it from being pulled out, while shoulders 2 2, Fig. 7, prevent the piece from being pushed in or moved sidewise whenever the part A is riveted down in place, as in Fig. 2, the said part A having a hole, t, Fig. 3, which fits over the earf and co-operates with it to hold it, as just described.

Having thus described my invention, what I claim as new is- 1. A lock-case made of sheet metal in three parts, two of said parts being struck up cupshaped, and the other being a plain surface, and all three being of the same diameter and connected by rabbeted edges, as shown and described.

2. The combination of the three parts A A A of the lock-case, the part A having one riveted connection with A and one riveted connection with A, and the two parts A A compartment, substantially as and for the purpose described.

3. The combination, with the part A, having an open place in its rim and an ear, d, of the detachable ear f, having a curved segment, 9, the fulcrum-pin, and the part A, adapted to hold the detachable ear in place, as described.

' FRANK W. MIX.

Witnesses:

H. B. PLUMB, R. J. PLUMB. 

